Elevator safety-lock.



E. J. BROWN. ELEVATOR SAFETY LOOK.

APPLICATION IILED we. go, 1905.

Patqnted May 4, 1909.

WITNESSES.

in: mamas PETERS 00., wnsnmuron, n. c

m r Q I AT7'0HN fEnw Rn J. BROWN, orBRooKLYN; NEW YORK.

ELEVATOR SAFETY-LOCK.

To all whom it may concern:

Be it known that I, EDWARD J. BROWN, a citizen of the United States, anda resident of Brooklyn,

York, have invented new and useful Improvements in ElevatorSafety-Locks, of

which the following is a specification.

My invention relates to elevators and it has for its object to provide asafety means which will prevent the operation of the starting meansexcept by: the operator and only when the operator is in position tooperate the car.

It has for its furtherobject to provide an automatic means for stoppingthe car.

In many of the systems now known in the art, wherein the elevatoris'started'by pulling a rope which passes the'length of the elevatorshaft, the motor may be started by any one located on any of the floorsof the elevator shaft. This is sometimes done when the operator has leftthe car. The removal of the car at such a time endangers the life notonly of the operator but also of any passengers who may wish .to use thecar.-

My 1nvent1on provides means for preventing the movement of the carunless under the control of the operator. Furthermore, if the operatorshould fail in his duty for any reason whatever the elevator will beautomatically stopped by my invention. Settling of the elevator car dueto leaking of valves is also of all passengers using the elevator towhich my invention is applied is greatly enhanced.

My invention comprises a means for operating and controlling thestarting means of the motor. The controlling meansis automaticallyoperated to stop the car and the car is held stationary. The controllingmeans may be secured to the car and upon movement of the car thestarting rope may be operated to bring the car to a standstill and tomaintain it in that position. i

The invention comprises other features which appear in thefollowingdescription, are shown in the drawing and are claimed in theclaims. I

Referring to the drawing, Figure 1 illustrates a vertical sectional viewtaken through the center of the device embodying my invention. Fig. 2illustrates the top view of the device. 1

1, Fig. 1, is the supporting frame of the automatic grip device. Theframe 1 consists of two parts 2, 3, which are bolted to- Specificationof Iietter s Patent. I

county of Kings, State of- New prevented. Thus the safety I Patentuvray'a, 1909.

Application filed August so, 1905, SeriaI No. 275,453.

gether bynieans of bolts 4, 5, which pass through ears located on eachside of the parts 2, 3. [The-frame 1 has a base plate 6 having holes 7through which screw bolts maybe passed for securing the device to thefloor of the elevator car or for securing it in any Other properposition conducive to effectual working of the device.

' A slot 9 is formed in part 8 of the frame 1. On each side of the slot9 are located cars which form supports for pivot pins 10, 10 for wheels11, 11. The wheels 11, 11 are I located in the slot 9 and areeccentrically mounted on' the pivot pins 10, 10. The

wheels or, cams 11,11 have in each case a groove12 in. thecircumference.

13 is the starting rope well known in the art, which starts the elevatorcar up when it is pulled down and which starts the elevator car downwhen it is pulled up and which stops the car when pulled to anintermediate position. The starting rope 13 is located between thegrooved cam wheels 11, 11 and the frame 1. As the cam wheels 11, 11 areturned they operate either to grip the starting rope or to release it.

The wheels 11, 11 are turned by the oper ation of links 14, 14 which areloosely attached to the wheels 11, 11 by means of loosely mounted pins15, 15 which pass through the links and wheels at points near thecircumferences of the wheels. Channels 16, 16 are cut into the wheels11, 11, which permit of movement of the wheels with respect to the links14, 14. The links 14, 14 are also loosely attached to a bell-crank lever17 which ispivoted at 26 to the base plate 6 of theframe 1. Thebell-crank lever may be operated by hand or by foot. In the form ofdevice shown it is operated by foot. A pin 18 having a fork 19 isprovided and is connected to the arm 20 of the lever 17 by the pin 27.The pin 18 passes up through the flooring 8 and is provided with a head21. The head 21 is adapted to be pressed downward by a foot of theoperator.

The pivot connections of the di'fierent parts of the device are loose sothat there is a free movement of one with respect to the other. In thedrawing slots are shown located in the parts in which the pivot pins areinserted to connect the said parts together. This allows a free movementof the cams with respect to each other. This is true of all of the pivotpins of the device excepting the pivot pin about which the arm 20 isremoved the spring 22 lifts the lever arm 20 and causes the links 1 1,14 to turn the cams 11, 11 so that they will grip the motor controllingrope 13. hen the car is moving up the gripping mechanism will seize themotor controlling rope 13 and pull it up untilthe car stops. The same istrue When the car goes down. The rope can not be again moved until thegripping mechanism is operated upon to release the rope when it may bepulled up or down according'to the direction that it is-desired to startthe car. The rope can not therefore be moved unless it is done by someone in the car and; then only upon the operation of thegrippingmechanism to release the controlling rope 13.

that I claim as new and desire to secure by Letters'Patent is as followsz- '1. Inan elevator the combination of a frame located on the elevatorcar, a starting rope movable in the said frame, a pair of cams mountedin the said frame, links attached to the said cams and adapted tooperate the same, a lever also mounted in the said frame and attached tothe said links and manual means for operating the said lever.

2. In an elevator system the combination of a tubular frame having aslot, cams mounted in the said slot, links attached to the said cams andadapted to turn them, a lever attached to the said links, and a foot pinadapted to operate the said lever.

3. In an elevator the combination of a pair of cams, a starting rope, aspring for causing the said cams to frictionally engage With the saidrope, a lever, links for connecting the said lever to the said cams anda manual means for Withholding the operation of the said spring, a frameadapted to r ceive the said rope and to support the said parts, the saidframe being located on the elevator car.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribin witnesses.

EDVARD J. BROWN.

Vitnesses FAUST- F. CRAMP'roN, ALEX. BROUGH'.

